tree b37f6853d0bdedc6a46cd44d1f2484208ace1ca5
parent a94b9367e044ba672c9f4105eb1516ff6ff4948a
author Wei Wang <weiwan@google.com> 1507316765 -0700
committer David S. Miller <davem@davemloft.net> 1507407778 +0100

ipv6: don't release rt->rt6i_pcpu memory during rt6_release()

After rwlock is replaced with rcu and spinlock, route lookup can happen
simultanously with route deletion.
This patch removes the call to free_percpu(rt->rt6i_pcpu) from
rt6_release() to avoid the race condition between rt6_release() and
rt6_get_pcpu_route(). And as free_percpu(rt->rt6i_pcpu) is already
called in ip6_dst_destroy() after the rcu grace period, it is safe to do
this change.

Signed-off-by: Wei Wang <weiwan@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>